An insulated conducting shell is exposed to a radiation of wavelength $\mathrm{\lambda }$ .The threshold wavelength of the conducting shell is ${\mathrm{\lambda }}_0>\mathrm{\lambda }$. Since energy of incident photon is greater than threshold energy, the emission of photoelectrons will occur and due to it sphere gets charged and its potential becomes V₀ and at this moment emission of photoelectrons stops. (e is the magnitude of charge of electron)

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